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HIP2103 датащи(PDF) 14 Page - Renesas Technology Corp

номер детали HIP2103
подробное описание детали  60V, 1A/2A Peak, Half Bridge Driver with 4V UVLO
PDF  21 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HIP2103 датащи(HTML) 14 Page - Renesas Technology Corp

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HIP2103, HIP2104
FN8276 Rev 0.00
Page 14 of 21
November 27, 2013
Selecting the Boot Capacitor Value
The boot capacitor value is chosen not only to supply the internal
bias current of the high-side driver but also, and more
significantly, to provide the gate charge of the driven FET without
causing the boot voltage to sag excessively. In practice, the boot
capacitor should have a total charge that is about 20 times the
gate charge of the driven power FET for approximately a 5% drop
in voltage after charge has been transferred from the boot
capacitor to the gate capacitance.
The following parameters are required to calculate the value of
the boot capacitor for a specific amount of voltage droop when
using the HIP2103, HIP2104. In the following example, some
values used are specific to the HIP2103, HIP2104 and others are
arbitrary. The values should be changed to comply with the
actual application.
The following equations calculates the total charge required for
the Period:
Qc = Qg40_12V + Period x (IHB + VHO/RGS + Igate_leak)
Cboot = Qc/(Ripple * VDD)
Cboot = 0.324µF
If the gate to source resistor is removed (RGS is usually not
needed or recommended), then:
Cboot = 0.124µF
VDD = 12V
This is the nominal value of VDD for
the HIP2104
VHB = VDD = VHO
High side driver bias voltage
referenced to VHS
Period = 100µs
This is the longest expected switching
period
IHB = IHBS20K + IHB20K = 295µA High side driver bias current at 20kHz
RGS = 10kΩ
Gate-source resistor
Ripple = 5%
Desired ripple voltage on the boot cap
Igate_leak = 100nA
Gate leakage current (from vendor
datasheet)
Qg40_12V = 45nC
From Figure 20
FIGURE 20. TYPICAL MOSFET GATE CHARGE vs GATE VOLTAGE
4
2
0
6
8
10
12
14
16
0
5
10
15
20
25
30
35
45
50
60
Qg, GATE CHARGE (nC)
Vds = 40V
Vds = 80V
Typical Applications
FIGURE 21. HALF BRIDGE MOTOR DRIVE TOPOLOGY
uController
HIP2104
VBAT
VCen
VCC
VDD
HI
LI
E
P
A
D
LO
HS
HO
HB
VDen
VSS
DC
MOTOR
Vbatt
50Vmax
Vbatt



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